cdr ['k,duhr], n. 1. a. (of a cons) the component of a cons corresponding to the second argument to cons; the other component is the car. ``The function rplacd modifies the cdr of a cons.'' b. (of a list L1) either the list L2 that contains the elements of L1 that follow after the first, or else nil if L1 is the empty list. 2. the object that is held in the cdr[1]. ``The function cdr returns the cdr of a cons.''

closev.t. (a stream) to terminate usage of the stream as a source or sink of data, permitting the implementation to reclaim its internal data structures, and to free any external resources which might have been locked by the stream when it was opened.

compiler macron. an auxiliary macro definition for a globally defined function or macro which might or might not be called by any given conforming implementation and which must preserve the semantics of the globally defined function or macro but which might perform some additional optimizations. (Unlike a macro, a compiler macro does not extend the syntax of Common Lisp; rather, it provides an alternate implementation strategy for some existing syntax or functionality.)